10–14 Nov 2025
CERN
Europe/Zurich timezone

Improving spatial and temporal resolution of 3D diamond detectors using TPA characterisation and neural network

13 Nov 2025, 16:10
20m
6/2-024 - BE Auditorium Meyrin (CERN)

6/2-024 - BE Auditorium Meyrin

CERN

114
Show room on map
WG6 - Wide bandgap materials WG6/WP3 - Wide bandgap detectors

Speaker

Huazhen Li (The University of Manchester (GB))

Description

3D diamond detectors feature conductive column arrays fabricated within Chemical Vapour Deposition (CVD) diamond using femtosecond-laser graphitization. In this work, several 3D geometries are simulated, with electric fields simulated in Sentaurus TCAD and signal responses studied via Monte Carlo simulations using Garfield++. Then a Neural Network (NN)–based algorithm is developed to analyse signal waveforms and enhance spatial and temporal resolutions by predicting the hit position and time of arrival. Detector prototypes with various electrode configurations are fabricated using a femtosecond laser system equipped with a Spatial Light Modulator (SLM). The Two-Photon Absorption (TPA) technique is employed to generate localized charge distributions inside the sensors, enabling high-resolution characterization. The prototypes are further tested with CERN SPS test beam to evaluate detector performance under realistic experimental conditions.

Type of presentation (in-person/online) in-person presentation
Type of presentation (I. scientific results or II. project proposal) I. Presentation on scientific results

Authors

Huazhen Li (The University of Manchester (GB)) Alexander Oh (The University of Manchester (GB))

Co-authors

Prof. Marco Gersabeck (Albert Ludwigs Universitaet Freiburg (DE)) Oscar Augusto De Aguiar Francisco (The University of Manchester (GB)) Dr Patrick Parkinson (The University of Manchester (GB))) Dr Olivier Allegre (The University of Manchester) Dr Patrick Salter (University of Oxford) Dr Charles Smith (The University of Manchester (GB))) Dr Nawal Al-Amairi (University of Technology and Applied Science)

Presentation materials